Which statement about plumbing codes is true?

Plumbing codes are designed to ensure safety, sanitation, and efficiency within plumbing systems. The statement that they provide guidelines for materials is accurate because plumbing codes outline the types of materials that are acceptable for use in plumbing installations. These guidelines help ensure that materials meet safety standards, compatibility with water supply, durability, and suitability for various plumbing applications.

While codes may contain specific requirements, they are established based on industry standards and best practices to guide plumbers and contractors in implementing safe and reliable plumbing systems. The focus on materials includes considerations such as pipe types, fittings, and fixtures, ensuring that they are appropriate for their intended use and that they comply with health and safety regulations. This guideline aspect is crucial for the longevity and functionality of plumbing systems.

Other options mention aspects that could misrepresent the purpose and scope of plumbing codes. For instance, plumbing codes do not specify exact locations of drains as this can vary based on building design and local regulations. They are not merely suggestions, but enforceable regulations that must be followed to ensure compliance and safety. Lastly, plumbing codes apply to both residential and commercial plumbing, covering a wide range of installations across various types of buildings.